Health insurers are girding for a fight over who should regulate the new marketplaces that would sell policies to 30 million Americans under the healthcare bills pending in Congress, the Wall Street Journal reports. Congressional Democrats and insurance companies both say they want robust regulation of the "exchanges" to prevent deceptive marketing of health plans and to ensure that customers can exercise the rights guaranteed by the bills. At issue is who should do the regulating: the federal government, as the House bill says, or the states, as the Senate prescribes, the Journal reports.